WebSVN - shark - Blame - Rev 1683 - /shark/branches/xen/arch/x86/x1.c

Rev	Author	Line No.	Line
2	pj	1	/* Project: OSLib
		2	* Description: The OS Construction Kit
		3	* Date: 1.6.2000
		4	* Idea by: Luca Abeni & Gerardo Lamastra
		5	*
		6	* OSLib is an SO project aimed at developing a common, easy-to-use
		7	* low-level infrastructure for developing OS kernels and Embedded
		8	* Applications; it partially derives from the HARTIK project but it
		9	* currently is independently developed.
		10	*
		11	* OSLib is distributed under GPL License, and some of its code has
		12	* been derived from the Linux kernel source; also some important
		13	* ideas come from studying the DJGPP go32 extender.
		14	*
		15	* We acknowledge the Linux Community, Free Software Foundation,
		16	* D.J. Delorie and all the other developers who believe in the
		17	* freedom of software and ideas.
		18	*
		19	* For legalese, check out the included GPL license.
		20	*/
		21
		22	/* File: X1.C */
		23	/* Startup code: */
		24	/* Build parameters list & make info accessible */
		25
1621	fabio	26	#include <arch/stdlib.h>
2	pj	27	#include <ll/i386/hw-func.h>
		28	#include <ll/i386/cons.h>
		29	#include <ll/i386/mb-info.h>
		30
		31	#include <ll/i386/mem.h>
		32
		33	FILE(X1);
		34
		35	/* #define __DUMP_MEM__ */
		36
		37	/* We need to copy from X address space to the application space */
		38	/* the info structure to allow pointer access using flat model */
		39	/* Remember that flat model is similar to small model also if we */
		40	/* can see the whole memory, because it has no explicit far */
		41	/* pointers; then if we pass into _args[] the address of the */
		42	/* string of the n-th argument it could not be correctly accessed */
		43	/* because it lies in a memory zone unseen from PM application. */
		44	/* This is due to the ELF format which has no relocation info */
		45	/* since the file is already relocated starting from address 0! */
		46	/* Then the PM application cannot see a real flat memory (segment */
		47	/* with 0 base) but CS,DS & SS MUST have the base correctly set. */
		48	/* Refer to this figure: */
		49	/* */
		50	/* DOS Memory <- X is there */
		51	/* */
		52	/* EXTENDED Memory -----[ */
		53	/* [ */
		54	/* Address xxxx [ <- Application code is here! */
		55	/* [ */
		56	/* Address yyyy [ <- Application Data & Stack! */
		57	/* */
		58	/* Then CS has xxxx base while DS & SS have yyyy base! */
		59
		60	/* Stack base address; use this to check stack overflow! */
		61	/* With Flat model I do not think we can use 386 protection */
		62	/* to detect a stack overflow; anyway Watcom C use a standard */
		63	/* function __CHK to detect it! The compiler place it whenever */
		64	/* it calls a function to detect overflow */
		65
40	pj	66	DWORD _stkbase;
2	pj	67	DWORD _stktop;
		68
		69	/* This is some extra stuff we need to compile with argument */
		70	/* passing and math extensions */
		71	DWORD _argc = 0;
		72	typedef char *charp;
		73	charp _argv[100];
		74
40	pj	75	#ifndef MAIN
		76	#define MAIN main
		77	#endif
		78
		79	extern void MAIN(int argc,char *argv[]);
2	pj	80	extern void bios_save(void);
		81	extern void bios_restore(void);
		82
		83	/* This is used in GNU-C to implement C++ constructors/destructors */
		84	/* See the lib sources for more details */
		85	void __main(int argc, char **argv)
		86	{
		87	}
		88
		89
40	pj	90	struct multiboot_info * mbi_address(void)
2	pj	91	{
40	pj	92	/* This is declared in [wc32/gnu]\x0.[asm/s] */
		93	extern struct multiboot_info *mbi;
2	pj	94
40	pj	95	return (mbi);
2	pj	96	}
		97
		98	void _startup(void)
		99	{
40	pj	100	register int i = 0;
94	giacomo	101	char temp[1000];
40	pj	102	struct multiboot_info *mbi = mbi_address();
		103	char cmdline = (char )(mbi->cmdline);
2	pj	104
40	pj	105	if (!(mbi->flags & MB_INFO_MEMORY)) {
		106	cputs("X/Runtime library error!!! Unable to find memory information!\n");
		107	l1_exit(-1);
		108	}
94	giacomo	109
40	pj	110	if (mbi->flags & MB_INFO_CMDLINE) {
		111	/* Build parameter list, up to 100 parms... */
94	giacomo	112	while (cmdline[i] != 0 && i < 1000) {
		113	temp[i] = cmdline[i];
		114	_argv[_argc] = &(temp[i]);
		115	while (cmdline[i] != ' ' && cmdline[i] != 0 && i < 1000) {
		116	temp[i] = cmdline[i];
		117	i++;
		118	}
40	pj	119	if (cmdline[i] == ' ') {
94	giacomo	120	temp[i] = 0; i++; _argc++;
40	pj	121	}
2	pj	122	}
94	giacomo	123	temp[i] = 0;
40	pj	124	_argc++;
		125	}
		126
		127	bios_save();
		128	/* Call main procedure using standard C convention */
		129	/* Remember you cannot call any console I/O function */
		130	/* if you do not call bios_save() */
94	giacomo	131
		132
2	pj	133	#ifdef __DUMP_MEM__
40	pj	134	message("X/MEM : %u\n",mbi->mem_upper);
		135	message("DOS/MEM : %u\n",mbi->mem_lower);
		136	message("x_bios Size : %u\n",sizeof(X_BIOSCALL));
		137	message("mbi Size : %u\n",sizeof(struct multiboot_info));
		138	message("Cmdline : %s\n",mbi->cmdline);
94	giacomo	139	message("Argc : %u\n",_argc);
		140	message("Argv[0] : %s\n",_argv[0]);
40	pj	141	message("Argv[1] : %s\n",_argv[1]);
		142	message("Argv[2] : %s\n",_argv[2]);
		143	message("Argv[3] : %s\n",_argv[3]);
2	pj	144	#endif
40	pj	145	MAIN(_argc,_argv);
		146	bios_restore();
2	pj	147	}

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